What is Tina's highest level of education?

Tina's highest level of education is represented by the fact that she is about to receive a Bachelor's degree in accounting. This status indicates that she has completed the necessary coursework required for a degree and is at the final stage of obtaining her diploma. In an educational context, a Bachelor's degree signifies a significant achievement and a level of expertise in a specific field, which in Tina's case is accounting. This level of education not only highlights her academic accomplishments but also reflects her commitment to her professional development.

Considering the other options, while high school graduation, pursuing a master's degree, and having completed some college coursework indicate varying levels of educational attainment, none match the completion stage of a Bachelor's degree that Tina is currently experiencing. Therefore, option C is the most accurate representation of her educational status.